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