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)(25,26,30,32)(27,34,36,31)(28,37,38,33)(29,39,40,35)(2,3)(6,7)(9,10,14,11)(12,15,20,17)(13,16,22,18)(19,23,21,24)(25,27)(26,31)(28,35)(29,33)(30,36)(32,34)(37,40)(38,39)(1,2,5,3)(4,6,8,7)(10,11)(15,17)(16,18)(23,24)(26,32)(28,38)(31,34)(35,39)(9,11,14,10)(12,17,20,15)(13,18,22,16)(19,24,21,23)(25,28,30,38)(26,33,32,37)(27,35,36,39)(29,34,40,31)(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)(28,35)(29,37)(30,36)(31,32)(33,40)(38,39)(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)(26,35,32,39)(27,33,36,37)(28,34,38,31)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.