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