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