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