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