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