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