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