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)(11,15)(17,18)(19,20)(21,24)(22,23) involution — undirected(1,3,5,8)(2,6,7,4)(9,10)(11,14)(12,13)(15,16)(17,19)(18,22)(20,24)(21,23)(26,29)(30,32)(3,8)(4,6)(9,10,12,13)(11,14,15,16)(17,20)(18,23)(19,24)(21,22)(25,26)(27,30)(28,29)(31,32)(1,4)(2,3)(5,6)(7,8)(9,10)(11,16)(12,13)(14,15)(17,19)(18,20)(21,23)(22,24) involution — undirected(1,2)(3,6)(4,8)(5,7)(9,11,12,15)(10,14,13,16)(17,20)(18,23)(19,24)(21,22)(25,27,28,31)(26,30,29,32)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.