What kind of jobs can I get if I get a graduate degree in cognitive psychology?

You could become a researcher as mentioned above who does scientific experiments/testing, although most of those jobs require Ph.D's or being supervised by one. Cognitive psychology is an interesting field in that it could be related to other areas such as neuropsychology (the physiology of the brain), or studying how the brain works. Do you want to teach cognitive psychology? I had a professor in college who obtained a Ph.D. in psychology though her specialty was in cognitive psychology.

You may also want to speak with psychology professors of schools that you are interested in, or have a specialty in cognitive psychology and obtain their ideas and opinions. Psychology professors from your undergraduate institution may be helpful as well.

Most of the jobs, with a masters level degree, would entail working in a university setting in a laboratory with a doctoral level psychologist (or a team of Ph.D. level psychologists). "Research Coordinator" is a typical title for such positions. There are other options as well as a function of the focus of your masters degree.