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