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