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