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