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