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