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