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