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