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