The Ada Lovelace Day website has some excellent posters for educating yourself and for educating students. The one that caught my eye first is the “Amazingly Enormous Careers in STEM Poster.”
Others include “Ten Types of Scientist poster,” “Ada Lovelace poster,” and “Mary Anning poster.”
You can download the posters from the Ada Lovelace Day website or buy them already printed out and ready to be put on display. Here’s the Careers in STEM one, not very readable at this size, but enough to give you an idea what you’d get if you bought the poster.