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