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