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