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