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