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