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