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