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