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