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