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