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