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