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