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