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