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