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