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)(13,14,18,23,19,16,17,22)(15,24,25,27,26,21,28,20)(5,6)(7,10)(8,11)(9,12)(13,15)(14,20)(16,27)(17,25)(18,28)(19,26)(21,23)(22,24) involution — undirected(1,2,3,4)(5,7,10,6)(8,11,9,12)(13,15)(14,21)(16,24)(17,28)(18,25)(19,26)(20,23)(22,27)(5,8,10,9)(6,11,7,12)(13,16,18,22,19,14,17,23)(15,24,25,27,26,21,28,20)(5,9,10,8)(6,11,7,12)(13,17,19,18)(14,22,16,23)(15,25,26,28)(20,24,27,21)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.