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