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