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