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