I’m reposting this because there is a useful listing of tools over at the Creative Bloq for creating infographics. (I think Piktochart is the easiest to use for the infographic assignment, but there’s other options. Also, there’s a link to Canva, which Keith mentioned there.)
I’m fairly impressed by Piktochart for more complex infographics, and Easel.ly is a nice tool for simple visualizations.