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