Yes, you can get a job absolutely after a Computer Science diploma. Actually, most of the employers look to recruit a candidate holding a diploma in IT-related entry-level positions. There is always high demand for IT-skilled workers and a good basis of training on programming, software development, etc.
The opportunities available in terms of job and salary prospects will vary depending on the reputation of your institution, academic performance, and specific skills you have acquired. A good portfolio of projects, as well as practical experience gained through internships, can also enhance your chances of getting hired.