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