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