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