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