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