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