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