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