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