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