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