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