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