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)(11,14)(12,16)(13,15)(18,22)(23,25)(24,31)(26,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,14,15,16)(17,18)(19,26)(20,22)(21,23)(24,30)(25,29)(27,32)(28,31)(9,12,13,11)(10,14,15,16)(18,23)(21,29)(22,25)(24,32)(26,31)(28,30)(2,6)(5,7)(18,22)(19,27)(23,25)(28,30) involution — undirected(3,8)(5,7)(17,19,20,27)(18,24,22,31)(21,30,29,28)(23,32,25,26)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.