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