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