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