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