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