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