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)(19,26)(21,29)(27,30)(28,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,14,15,16)(17,18)(19,27)(20,24)(21,28)(22,25)(23,31)(26,30)(29,32)(9,12,13,11)(10,14,15,16)(17,19)(18,21)(20,28)(22,26)(23,32)(24,30)(25,29)(27,31)(2,6)(5,7)(17,20,22,23)(18,24,25,31)(19,28,26,32)(21,30,29,27)(3,8)(5,7)(17,21)(18,19)(20,27)(22,29)(23,30)(24,32)(25,26)(28,31) 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.