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