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