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