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