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