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