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