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