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