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