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