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