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