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