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