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