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