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