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