Shows Bruhat order for standard parabolic subgroups.
This is a bit suboptimal right now because the internal representation of Coxeter groups requires the whole group to be enumerated, which is bad for taking quotients. E8/E7 only has 240 elements for example, but the internal representation used means that the whole ~700 million elements of E8 would need to be enumerated before showing these.
In the graphic below, click on the nodes of the Dynkin diagram to select a parabolic subset.