Try this spar driver, it's universal so it should support the 75xx machines. Worst case scenario it doesn't and you waste 3 minutes trying, best case it resolves the issue.
Unfortunately I did this and had the same results.
can you remove the printer from your system
then add the printer again, but choose IP => IPP protocol, manually enter the IP address, choose te correct PPD file and test again
I have been unable to get any document to print from inDesign CC 2015 on a Mac running El Capitan and Xerox Driver 3.68.0. The only thing that prints is a generic Error Notice and says "The job was deleted becuase the client requested a printing function that is not avaible." The same docuemtn prints OK when saved to a PDF from both Acrobat an Preview.
Any help would be appreciated.