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