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