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