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