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