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