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