[R] use of color for hclust

[Globe Trotter]

Hi,

I have a grouping of some observations. I want to cluster them using
hierarchical clustering and compare how the hierarchical clustering shows up
vis-a-vis the groupings. Is it possible to do this in color? I guess what I am
looking for is a way to color the labels of a hierarchical clustering plot
using different colors according to the original grouping. Any suggestions?

Many thanks and best wishes!