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)(15,22)(16,20)(17,27)(18,21)(19,26)(23,24)(25,28)(5,6,9,10)(7,8,12,11)(13,15)(14,19)(16,26)(17,25)(18,23)(20,24)(21,28)(22,27)(2,4)(5,7)(6,11)(8,10)(9,12)(15,23)(19,28)(22,24)(25,26) involution — undirected(6,10)(7,12)(13,14)(15,24)(16,20)(17,27)(18,21)(19,25)(22,23)(26,28) involution — undirected(5,8,9,11)(6,7,10,12)(13,16,18,17)(14,20,21,27)(15,25,23,26)(19,22,28,24)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.