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