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