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