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