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