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