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