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