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