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