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