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