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