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)(13,17)(14,24,26,18)(15,19)(16,20)(21,35,37,29)(22,30)(23,31)(25,38,40,32)(27,33)(28,34)(36,42,39,41)(3,5)(4,7)(6,10)(8,9)(11,13,16,23)(12,17,20,31)(14,21,26,37)(15,27,28,22)(18,29,24,35)(19,33,34,30)(25,39,40,36)(32,42,38,41)(5,10)(7,9)(11,14)(12,18)(13,21)(15,25)(16,26)(17,29)(19,32)(20,24)(22,36)(23,37)(27,39)(28,40)(30,41)(31,35)(33,42)(34,38) involution — undirected(4,8)(7,9)(11,15,16,28)(12,19,20,34)(13,22,23,27)(14,25,26,40)(17,30,31,33)(18,32,24,38)(21,36,37,39)(29,41,35,42)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.