Here's a nice little touch that I would not mind seeing added one fine day:
A discreet little square box in different colors on each divider line, say on the left. Or some equivalent graphical means to let me see, without reading, what particular divider it is I am looking at. This would slightly speed up my visual orientation on the page.
I usually like to minimize the amount of actual reading that I have to do; if I can get away with just seeing what it is, it is more convenient. The words are still useful as a backup.
Detail: Currently, each divider line has an icon that lets you know which sorting mode you are in. That is good. Perhaps the colored square could be a background color or border for this icon. Or the colored marker could be a little vertical bar on the very left, left of the icon. I am sure there are many other possibilities, too.