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