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