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