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