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