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