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