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