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