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