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