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