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