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