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