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