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