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