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