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