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