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