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