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