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