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