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