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