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