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