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