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