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