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