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