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