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