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