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