One vertex per element, one color per generator, with an edge from x to x·s.
(6,10)(8,11)(14,18)(15,20)(22,26)(24,28) involution — undirected(2,4)(5,6,9,10)(7,8,12,11)(13,14,17,18)(15,19,20,16)(22,26)(23,27)(1,2)(3,4)(6,10)(8,11)(13,15)(14,19)(16,18)(17,20)(21,22,25,26)(23,24,27,28)(5,7,9,12)(6,11,10,8)(13,15)(14,19)(16,18)(17,20)(21,23,25,27)(22,24,26,28)(5,8,9,11)(6,7,10,12)(13,16,17,19)(14,20,18,15)(21,24)(22,27)(23,26)(25,28)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.