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