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