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