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