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