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