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