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