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