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