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