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