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)(25,26,29,30)(27,28,32,31)(2,5)(6,7)(9,10,13,12)(11,14,16,15)(17,18,21,22)(19,20,23,24)(25,26)(27,31)(28,32)(29,30)(3,8)(6,7)(18,22)(19,23)(26,30)(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)(25,27)(26,28)(29,32)(30,31)(1,2)(3,6)(4,5)(7,8)(9,12,13,10)(11,15,16,14)(17,20)(18,19)(21,24)(22,23)(25,28)(26,27)(29,31)(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.