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