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)(19,26,20,23)(22,25,28,31)(27,32,29,30)(1,3,6,2)(4,8,5,7)(9,11,12,15)(10,13,14,16)(19,27)(20,29)(22,28)(23,30)(25,31)(26,32)(10,14)(13,16)(17,19,28,29,21,20,22,27)(18,23,31,32,24,26,25,30)(1,4,6,5)(2,7,3,8)(19,20)(23,26)(27,29)(30,32)(1,5,6,4)(2,7,3,8)(17,20,22,29,21,19,28,27)(18,23,25,30,24,26,31,32)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.