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