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