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