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