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