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