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