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