What you are referring to is different than what the question was. You are talking about Secure Print, where the original question was more of an "Accounting" type.
Are you still looking for support or was your question answered?
You would need to set up Xerox accounting and then grant or restrict color printing. Here are some articles:
How To Enable and Configure Accounting Through a Network Server
Print Jobs are in Black and White instead of Color Using Xerox Standard Accounting (XSA)
Hi! Is there a way to apply passcode when printing colored documents in Versalink C7030?