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