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