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