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