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