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