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)(12,17)(13,21)(18,24)(25,26)(27,35)(28,38)(29,40)(30,31)(32,37)(33,39)(34,36)(3,7)(5,8)(10,15)(12,17)(13,21)(18,24)(25,27)(26,32)(28,36)(29,39)(30,35)(31,37)(33,34)(38,40) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,10,14,15)(11,17,19,12)(13,16,21,22)(18,23,24,20)(25,26,31,30)(27,32,37,35)(28,38,39,33)(29,34,36,40)(9,11,14,19)(10,12,15,17)(13,18,21,24)(16,20,22,23)(25,28,31,39)(26,33,30,38)(27,36,37,29)(32,34,35,40)(1,3)(2,5)(4,7)(6,8)(9,12)(10,11)(13,20)(14,17)(15,19)(16,18)(21,23)(22,24)(25,29,31,36)(26,34,30,40)(27,28,37,39)(32,38,35,33)(1,2)(3,5)(4,6)(7,8)(9,13)(10,16)(11,18)(12,20)(14,21)(15,22)(17,23)(19,24)(25,30,31,26)(27,32,37,35)(28,38,39,33)(29,40,36,34)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.