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