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