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