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