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