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