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