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