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