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