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