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