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