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