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