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