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