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