The plugin populates whatever wordpress returns, so it looks like the colors are set that way or modified later on during the execution or via CSS files via different rules.
Note that the live results list is not the same as the singular posts or the loop page.
You could however try to reconstruct the same layout via these settings and a custom description field: https://i.imgur.com/FckWRc8.png
Custom description field value:
<div class="box" style="background-color:{bg-farbe}">{descriptionfield}</div>
Please note that this is beyond regular support (customization), so I can’t guarantee anything, but this should be very close to what you need.