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