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