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