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