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