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