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