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) involution — undirected(1,2,4,5)(3,6,7,8)(17,18,23,26)(19,27,31,29)(20,25,22,21)(24,28,32,30)(10,14)(15,16)(17,19,20,28,23,31,22,30)(18,24,21,29,26,32,25,27)(1,3,4,7)(2,6,5,8)(9,11,13,12)(10,15,14,16)(17,20,23,22)(18,25,26,21)(19,28,31,30)(24,27,32,29)(2,5)(6,8)(9,12,13,11)(10,16,14,15)(17,21,22,18,23,25,20,26)(19,29,30,24,31,27,28,32)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.