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