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