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