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