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