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