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