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