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