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