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