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