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