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