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