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