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