Depending on the job and employer, any graduate with an interest in information technology can work in IT: there are career opportunities for graduates from all degrees. Many graduates without computer science or technology degrees choose to focus on consultancy and business analysis roles, applying broad technical knowledge to a commercial environment and business processes. Information technology organisations may also have graduate roles in business support functions such as marketing and finance.
Specific technical jobs, such as network engineer, software developer, programmer/analyst, systems analyst really do require graduates with a technology degree, eg computer science, information systems, software engineering, telecoms engineering, physics, maths (with a computing component). You will need to have core skills such as programming languages, operating system knowledge, network and infrastructure understanding and development skills.
Hardware development, research and development, and device-level design roles can require degrees such as physics or electronics engineering.