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