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