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