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