One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,8)(6,7)(9,10)(11,12,16,21)(13,17,24,31)(14,19,25,33)(15,18,27,20)(22,29,35,40)(23,28,37,30)(26,32,38,34)(36,39,42,41)(4,7)(8,10)(11,13,16,24)(12,17,21,31)(14,22,25,35)(15,23,27,37)(18,28,20,30)(19,29,33,40)(26,36,38,42)(32,39,34,41)(3,5,6,9)(4,8,7,10)(12,18)(15,27)(17,28)(19,32)(20,21)(23,37)(26,38)(29,39)(30,31)(33,34)(36,42)(40,41)(11,14)(12,19)(13,22)(15,26)(16,25)(17,29)(18,32)(20,34)(21,33)(23,36)(24,35)(27,38)(28,39)(30,41)(31,40)(37,42) involution — undirected(14,25)(19,33)(22,35)(26,38)(29,40)(32,34)(36,42)(39,41) 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.