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)(20,28)(22,27)(23,25)(24,29)(26,31)(30,32) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,19,21,18,23,27,22,25)(20,26,30,24,29,32,31,28)(2,5)(6,8)(11,16)(13,14)(17,20)(18,24)(19,26)(21,30)(22,31)(23,29)(25,28)(27,32) involution — undirected(1,3,4,7)(2,6,5,8)(9,11)(10,14)(12,16)(13,15)(20,29)(24,28)(26,32)(30,31)(11,16)(13,14)(17,21,23,22)(18,19,25,27)(20,30,29,31)(24,26,28,32)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.