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