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