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)(11,15)(12,14)(13,16)(17,18,23,19)(20,28,31,32)(21,25,22,26)(24,30,27,29)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,16)(14,15)(17,19,23,18)(20,28,31,32)(21,26,22,25)(24,30,27,29)(9,10)(11,15,16,13)(12,14)(17,20,22,30,23,31,21,29)(18,24,25,32,19,27,26,28)(2,6)(5,7)(10,14)(13,15)(17,21,23,22)(18,25,19,26)(20,29,31,30)(24,32,27,28)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.