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)(13,16)(14,17)(15,18)(19,22)(20,24)(21,23)(25,26) involution — undirected(4,7)(8,10)(11,13,15,20)(12,16,18,24)(14,21,22,26)(17,23,19,25)(12,17)(14,22)(16,23)(18,19)(21,26)(24,25) involution — undirected(3,5,6,9)(4,8,7,10)(13,20)(16,24)(21,26)(23,25)(12,18)(16,24)(17,19)(23,25) involution — undirectedA 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.