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