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