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