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