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