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