This texture can be imported into the slicer to make the bed look like the actual PEI sheet.

Having the lines and logos at the correct positions makes it easier to position the model, e.g. that it doesn't touch the coloured regions, as the paint tends to stick to the printed model.

You can find the import option in the printer settings of the slicer. In Prusa you find the “Set” button under “General”→"Size and coordinates"→"Bed shape". In Orca it is under “Basic information”→"Printable space"→"Printable area". Clicking the “Set” button opens a window with buttons to load and remove the texture.
You also find the option to import a bed model in that window. You may want to use the “sovol_sv06plus_buildplate_model.stl” either from here or from @joescalon's original model (these are identical and only included, because this site requires at least one mesh model per project).

(Not sure how to use textures and/or bed models in Cura.)