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