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