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