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