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