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