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