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