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)(11,14)(12,20)(13,17)(15,19)(16,22)(18,24)(21,23)(27,29)(31,33)(35,37)(39,40)(2,5)(3,8)(9,11)(10,14)(12,18)(13,19)(15,17)(16,23)(20,24)(21,22)(25,26,30,34)(27,31,29,33)(28,36,38,32)(35,40,37,39)(1,3)(2,6)(4,5)(7,8)(9,11,13,19)(10,15,17,14)(12,21,22,18)(16,23,20,24)(25,27,30,29)(26,31,34,33)(28,35,38,37)(32,39,36,40)(1,4,7,6)(2,3,5,8)(9,11)(10,15)(12,18)(13,19)(14,17)(16,24)(20,23)(21,22)(1,5,7,2)(3,4,8,6)(9,10)(11,14)(12,16)(13,17)(15,19)(18,23)(20,22)(21,24)(25,28,30,38)(26,32,34,36)(27,35,29,37)(31,39,33,40)(1,6,7,4)(2,8,5,3)(9,12,13,22)(10,16,17,20)(11,18,19,21)(14,23,15,24)(25,29,30,27)(26,33,34,31)(28,37,38,35)(32,40,36,39)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.