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