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