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