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