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