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