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