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