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)(11,16)(12,14)(13,15) involution — undirected(1,3)(2,5)(4,8)(6,7)(17,18,22,24)(19,25,27,28)(20,21,30,26)(23,31,32,29)(9,11,13,12)(10,14,15,16)(17,19,26,31,22,27,21,29)(18,23,30,28,24,32,20,25)(2,6)(5,7)(19,27)(23,32)(25,28)(29,31) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,20,21,24,22,30,26,18)(19,28,29,23,27,25,31,32)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.