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