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