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