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)(11,14)(12,16)(13,15)(17,18)(19,28)(20,22)(21,31)(23,27)(24,26)(25,30)(29,32)(1,3,5,4)(2,6,8,7)(9,11,14,10)(12,16,13,15)(17,19)(18,25)(20,31)(21,24)(22,29)(23,30)(26,32)(27,28)(10,11)(15,16)(17,20,24,27,23,26,22,18)(19,25,29,32,30,28,21,31)(9,12,14,13)(10,15,11,16)(17,21,22,30,23,29,24,19)(18,25,26,31,27,28,20,32)(1,4,5,3)(2,7,8,6)(9,13,14,12)(10,16,11,15)(17,22,23,24)(18,26,27,20)(19,29,30,21)(25,32,28,31)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.