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