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