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