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