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