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