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