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)(27,35)(28,33)(29,34)(30,31)(32,36)(37,40)(38,39)(1,2,5,4)(3,7,8,6)(9,11,14,12)(10,15,17,18)(13,19,22,20)(16,23,21,24)(27,36)(29,37)(32,35)(34,40)(1,3,5,8)(2,6,4,7)(9,10,14,17)(11,15,12,18)(13,21,22,16)(19,24,20,23)(25,27,31,36)(26,32,30,35)(28,29,39,37)(33,40,38,34)(3,8)(6,7)(9,10)(11,15)(12,18)(13,16)(14,17)(19,23)(20,24)(21,22)(25,28,31,39)(26,33,30,38)(27,37,36,29)(32,34,35,40)(1,3)(2,7)(4,6)(5,8)(9,12,14,11)(10,15,17,18)(13,20,22,19)(16,23,21,24)(25,29,31,37)(26,34,30,40)(27,28,36,39)(32,38,35,33)(1,4,5,2)(3,6,8,7)(9,13,14,22)(10,16,17,21)(11,19,12,20)(15,23,18,24)(25,30,31,26)(27,32,36,35)(28,38,39,33)(29,40,37,34)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.