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