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