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