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