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