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