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