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