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