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