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