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