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