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