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