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