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