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