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