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