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