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