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