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