One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4,7,6)(5,9,10,8)(11,12)(13,19)(14,23)(15,17)(16,21)(18,25)(20,24)(22,26)(3,5)(4,8)(6,9)(7,10)(11,12)(13,20)(14,18)(15,17)(16,22)(19,24)(21,26)(23,25) involution — undirected(3,6,7,4)(5,9,10,8)(11,13)(12,16)(14,24)(15,22)(17,20)(18,26)(19,23)(21,25)(5,10)(8,9)(11,12)(13,16)(14,18)(15,17)(19,21)(20,22)(23,25)(24,26) involution — undirected(12,17)(16,20)(18,23)(19,26) 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.