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