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