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