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