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