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