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