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