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