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