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