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