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