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