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