Xerox Workcentre 7855 select b/w or color

Hi All,

I'm managing two Xerox Workcentre's 7855 with secure printing enabled on the network. Management wants me to change the default printing set to Black and White. But I just can seem to find where to do that. We are using the Xerox Global Print Driver PCL6 (5303.1600.0.0)

I suspected to find this setting in Printing Defaults but I don't have a tab for choosing Color or B/W

How can I set the default to Black and White and still give the option to my users to change this?