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