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