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