Thanks for kicking off another useful topic @ericmarceau. No built-in flag for this, but script -q -c "lynis audit system" lynis-report.txt captures the colored output, then view it with less -R. For HTML, pipe through aha: lynis audit system | aha > lynis-report.html. The raw data also lives at /var/log/lynis-report.dat after every run.
Reference for other readers: