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