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