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