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