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