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