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