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