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