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