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