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