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