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