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