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