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