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