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