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