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