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