Spoke to some co-workers who have run into your issue before.
Turns out if the copier is set to BW Linux cannot over-ride and all jobs will be BW. This is due to the nature of how the data goes over from the PPD only option. It sends RAW data and the printer decides what to do. (I'm sure I could get a more thorough explanation if needed, that is "just the gist" as I understood it)
So in CWIS check Properties > Services > Printing > General
