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