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