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