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