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