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