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