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