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