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