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