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