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