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