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