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