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