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