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