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