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)(12,15)(14,16)(17,18,22,26)(19,27,29,20)(21,32,23,25)(24,31,28,30)(1,3,4,8)(2,5,6,7)(11,16)(13,14)(17,19,22,29)(18,20,26,27)(21,28,23,24)(25,30,32,31)(10,13)(11,16)(14,15)(17,20,22,27)(18,24,26,28)(19,25,29,32)(21,31,23,30)(2,6)(5,7)(17,21,22,23)(18,25,26,32)(19,28,29,24)(20,30,27,31)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.