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