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