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