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