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