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