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