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