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