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