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