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