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