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