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