在ggplot中并排显示正确图例标签的boxplot

I am creating a side-by-side boxplot that is colored by hex colors. I seem to have it working, but am unable to get the legend (on the right of the plot) to have the cut labels (Ex: "Fair" instead of "#F8766D"). Here is a MWE that mimics my problem:I am creating a side-by-side boxplot that is co