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