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