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