GH_PreviewUtil groups of different colour wires

I'm creating a custom component to re-mesh high face count meshes into a simpler planar n-gon mesh.

An initial stage is a clustering algorithm which groups faces from the original mesh around random seed faces.  What I would like to do is preview each of these with different colour wires at the same time, is this possible or can GH_PreviewUtil only handle single wire colours drawn at any one time?