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