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