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