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