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