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