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