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