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