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