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