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