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