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