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