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