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