The graph in the post indicates that unemployment in all sectors went up after the financial crash, some were just hit by it more than others. Specifically, those who worked in construction suffered the worst from a collapse in real estate.

Also, that jobs that require "worthless" college degrees and/or oversaturated professional degrees (e.g. law grads) still have more job security than those with little to no post-secondary education.

It would be interesting to see a similar graph-by-occupation when the dot-com bubble burst. Would you see the exact opposite trend?