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