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