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