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