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