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