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