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