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