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