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