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