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