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