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