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