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