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