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