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