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