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