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