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