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