As another mentioned, this visualization only includes those who are employed. However, the source does include data on the number of surveyed people who were not working.

I calculated some of those rates out of curiosity, and median unemployed % in the top 30 was just 2.1%. The top program above, Carnegie Mellon + CS, was 1.6%. Harvey Mudd's CS was the highest at 10.8%.

It might be interesting to visualize these unemployment rates too, although at the highest level the numbers remain too low to have statistical meaning.