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