The color and name information needs to be formatted in the following way (separated by spaces, one region per line):
ID type name r g b a
8 2 Thalamus-right 0 0.7 0 1
The type can be either 1 (white matter), 2 (grey matter) or 3 (rest).
The source code of the visualization module can be downloaded here:
The resulting data can be save using the "Save cluster data" module.
Optionally, structural data can be loaded and added via the second input.