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