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