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