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