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