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