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