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