Know how a peinter works. The xerographic process.
Learn the back story and facts about the company.
Know the company and its diverse network of companies it works with.
I would ensure I was aware of Xerox internal IT Services and the need to ensure that IT Service are partly Outsourced but with a large in house IM Team owning overall Governance and Service Delivery Quality
Go smart dressed, with your resume and well knowledge of English.
Prepare for competency led interview and ensure the Xerox culture is known
Research the offerings and the structure