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