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