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)(16,24)(17,26)(20,27)(21,23)(25,28)(1,2)(3,4)(5,7)(6,9)(8,11)(10,12)(13,14,17,19,18,20,26,27)(15,16,23,24,22,25,21,28)(6,10)(7,11)(13,15)(14,16)(17,23)(18,22)(19,24)(20,25)(21,26)(27,28) involution — undirected(2,4)(6,10)(9,12)(14,20)(15,22)(19,27)(21,23) involution — undirected(13,16,17,24,18,25,26,28)(14,21,19,15,20,23,27,22)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.