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