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