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