One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(10,15)(11,16)(12,13)(17,18)(19,22)(20,23)(21,24)(25,31)(26,29)(27,30)(28,32) involution — undirected(9,10,14,11)(12,16,13,15)(17,19,21,26)(18,22,24,29)(20,25,27,32)(23,28,30,31)(2,5)(3,8)(6,7)(9,11,14,10)(12,16,13,15)(17,20)(18,23)(19,25)(21,27)(22,28)(24,30)(26,32)(29,31)(2,6)(5,7)(18,24)(22,29)(23,30)(28,31) involution — undirectedA 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.