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