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