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