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