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