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