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