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