Such a pity, Blender cannot do that(( Colored vertex groups.

It’s funny. such a simple thing like colored vertex groups in edit mode which may be very helpful while retopolgy process…

I know using Vertex paint I can make it but only in BI, when I use Cycles there is now way to do that!

Oh, how could be that?

(edit) delete… sorry no idea what the question is…

I mean that

Each vertex group has its own color, (not material!). Its very useful but it only works in BI…

how about using materials?

No. See the picture above your post.

I need colors to be displayed only in 3d viewport and according to vertex groups and I don’t want it to affect render. So, materials are not this case.