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