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