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