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