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