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