One vertex per element, one color per generator, with an edge from x to x·s.
(6,8)(9,10)(11,16)(12,14)(13,15)(17,18)(19,27)(20,23)(21,26)(22,25)(24,28)(29,31)(30,32) involution — undirected(1,2)(3,4)(9,11,13,12)(10,14,15,16)(18,23)(19,28)(20,21)(24,31)(25,26)(29,30)(2,4)(9,12,13,11)(10,14,15,16)(17,19,20,29,22,30,21,28)(18,24,26,32,25,31,23,27)(5,6,7,8)(18,25)(23,26)(24,31)(27,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.