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