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