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)(27,33)(28,35)(30,37)(32,39)(34,36)(38,40)(2,5)(6,8)(9,11,14,21)(10,15,18,24)(12,20,13,19)(16,23,17,22)(25,26)(27,30)(28,32)(29,31)(33,37)(34,38)(35,39)(36,40)(9,12,14,13)(10,16,18,17)(11,19,21,20)(15,22,24,23)(25,27)(26,30)(28,36)(29,34)(31,38)(32,40)(33,35)(37,39)(9,13,14,12)(10,17,18,16)(11,20,21,19)(15,23,24,22)(27,34)(30,38)(33,36)(37,40)(1,3,4,7)(2,6,5,8)(10,18)(15,24)(16,17)(22,23)(26,31)(27,34)(32,39)(33,36)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.