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