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