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