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