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