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)(11,14)(12,13)(15,16)(18,19)(20,24)(26,29)(30,32) involution — undirected(1,2,4,6)(3,5,7,8)(9,10,13,12)(11,14,16,15)(18,19)(22,23)(27,31)(30,32)(3,7)(5,8)(10,12)(14,15)(17,18,21,19)(20,22,24,23)(25,26)(27,30)(28,29)(31,32)(1,2)(3,5)(4,6)(7,8)(9,11,13,16)(10,14,12,15)(17,19,21,18)(20,23,24,22)(25,27)(26,30)(28,31)(29,32)(1,3,4,7)(2,5,6,8)(9,12,13,10)(11,15,16,14)(17,20)(18,22)(19,23)(21,24)(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.