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