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