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