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