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