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