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