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