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