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)(17,18,21,24)(19,25,27,32)(20,29,26,23)(22,30,31,28)(1,2,6,3)(4,7,5,8)(9,11,12,16)(10,13,14,15)(1,3,6,2)(4,7,5,8)(11,16)(13,15)(17,19,26,30,21,27,20,28)(18,22,29,32,24,31,23,25)(1,4,6,5)(2,7,3,8)(10,14)(13,15)(19,27)(22,31)(25,32)(28,30)(1,5,6,4)(2,7,3,8)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.