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