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