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