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