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