dargestellt
presented
Shown, depicted, or described in a certain way. Refers to the visual or textual presentation of information or objects.
Die im Diagramm dargestellten Ergebnisse sind eindeutig.
The results presented in the diagram are clear.

presented / portrayed
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presented
Shown, depicted, or described in a certain way. Refers to the visual or textual presentation of information or objects.
Die im Diagramm dargestellten Ergebnisse sind eindeutig.
The results presented in the diagram are clear.

'Dargestellt' (presented/portrayed) is the past participle of the separable verb 'darstellen' (to present/portray). The verb is made up of the prefix 'dar-' (an old form of 'da') and 'stellen' (to put/place) and literally means to put something up for viewing.
Der Film stellt die Ereignisse sehr dramatisch dar.
The film presents the events very dramatically.
As a past participle, 'dargestellt' (presented/portrayed) can be used as an adjective before a noun, in the perfect tense with 'haben' (to have), or in the passive with 'werden' (to become/be). These three uses are very common.
Die dargestellte Grafik zeigt die Verkaufszahlen.
The presented graphic shows the sales figures.
You can recognize this meaning from the context of information, data, or facts. Typical nouns are 'Ergebnisse' (results), 'Prozesse' (processes), 'Zahlen' (numbers), or 'Fakten' (facts), often in connection with graphics or reports.
Die im Bericht dargestellten Fakten sind alarmierend.
The facts presented in the report are alarming.
You can recognize this meaning from the context of art and acting. When it is about a 'Rolle' (role), a 'Figur' (character), a 'Charakter' (character), or a 'Schauspieler' (actor), it means embodying a person.
Die von ihm dargestellte Figur war der Bösewicht der Geschichte.
The character portrayed by him was the villain of the story.
written on
'beschrieben' and 'dargestellt' can both have to do with information on paper or in a text. Here, 'beschrieben' mainly means that something is written on a surface, for example on a sheet of paper or a note. 'dargestellt' more often means that something is shown or explained through an image, a graphic, or a text. So a sheet of paper can be 'beschrieben' because there is text on it. A problem or a process can be 'dargestellt' because it is shown in a particular form.

In der Grafik ist der Ablauf der Bewerbung einfach dargestellt.
The application process is presented simply in the graphic.
Auf dem Tisch liegt ein halb beschriebenes Blatt mit vielen Notizen.
On the table lies a half-written sheet of paper with many notes.