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