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