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