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