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