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