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