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