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