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