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