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