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