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