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