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