One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,7,6)(3,5,8,4)(9,10,15,12)(11,13,16,18)(14,20,23,17)(19,22,24,21)(25,26,30,34)(27,31,35,39)(28,32,38,37)(29,33,40,36)(1,3)(2,4)(5,6)(7,8)(9,11)(10,13)(12,18)(14,19)(15,16)(17,21)(20,22)(23,24)(27,35)(28,38)(31,39)(32,37) involution — undirected(10,12)(11,16)(17,20)(19,24)(25,27,30,35)(26,31,34,39)(28,36,38,33)(29,37,40,32)(1,4,7,5)(2,8,6,3)(9,12,15,10)(11,18,16,13)(14,20,23,17)(19,22,24,21)(1,5,7,4)(2,8,6,3)(9,13,15,18)(10,16,12,11)(14,22,23,21)(17,19,20,24)(25,28,30,38)(26,32,34,37)(27,36,35,33)(29,39,40,31)(1,6,7,2)(3,5,8,4)(9,14)(10,17)(11,19)(12,20)(13,21)(15,23)(16,24)(18,22)(25,29)(26,33)(27,37)(28,31)(30,40)(32,35)(34,36)(38,39)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.