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