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