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